quoted from Wiki:
[USS] Whale conducted surface patrols on the Truk-Empire shipping lanes until 17 January when she sighted a passenger/freighter bringing in troop reinforcements. Through the periscope, Whale observed hundreds of uniformed soldiers crowding the decks. She fired nine torpedoes and scored eight direct hits. All hits were necessary to sink the 9,815 ton Heiyo Maru; the cargo must have been of such a nature as to prevent her from sinking more rapidly.
end quote
never mind my previous feedback
